From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#17036: Continuation for Emacs: invoking a process on exit? Date: Thu, 20 Mar 2014 05:45:18 +0200 Message-ID: <83r45x8re9.fsf@gnu.org> References: <874n2v9l10.fsf@igel.home> <8361na9lom.fsf@gnu.org> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1395287170 2633 80.91.229.3 (20 Mar 2014 03:46:10 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 20 Mar 2014 03:46:10 +0000 (UTC) Cc: schwab@linux-m68k.org, 17036@debbugs.gnu.org To: Reuben Thomas Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Thu Mar 20 04:46:15 2014 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1WQTvr-00030r-6y for geb-bug-gnu-emacs@m.gmane.org; Thu, 20 Mar 2014 04:46:15 +0100 Original-Received: from localhost ([::1]:45066 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WQTvq-0004aI-Pg for geb-bug-gnu-emacs@m.gmane.org; Wed, 19 Mar 2014 23:46:14 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:47327) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WQTvi-0004Rg-VM for bug-gnu-emacs@gnu.org; Wed, 19 Mar 2014 23:46:11 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WQTve-0005J9-C7 for bug-gnu-emacs@gnu.org; Wed, 19 Mar 2014 23:46:06 -0400 Original-Received: from debbugs.gnu.org ([140.186.70.43]:40587) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WQTve-0005J5-8V for bug-gnu-emacs@gnu.org; Wed, 19 Mar 2014 23:46:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.80) (envelope-from ) id 1WQTvd-0004I9-Qy for bug-gnu-emacs@gnu.org; Wed, 19 Mar 2014 23:46:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 20 Mar 2014 03:46:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17036 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 17036-submit@debbugs.gnu.org id=B17036.139528711216431 (code B ref 17036); Thu, 20 Mar 2014 03:46:01 +0000 Original-Received: (at 17036) by debbugs.gnu.org; 20 Mar 2014 03:45:12 +0000 Original-Received: from localhost ([127.0.0.1]:41769 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WQTup-0004Gw-7h for submit@debbugs.gnu.org; Wed, 19 Mar 2014 23:45:11 -0400 Original-Received: from mtaout22.012.net.il ([80.179.55.172]:51508) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WQTum-0004Gj-6n for 17036@debbugs.gnu.org; Wed, 19 Mar 2014 23:45:09 -0400 Original-Received: from conversion-daemon.a-mtaout22.012.net.il by a-mtaout22.012.net.il (HyperSendmail v2007.08) id <0N2P00900U6JR600@a-mtaout22.012.net.il> for 17036@debbugs.gnu.org; Thu, 20 Mar 2014 05:45:06 +0200 (IST) Original-Received: from HOME-C4E4A596F7 ([87.69.4.28]) by a-mtaout22.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0N2P009VHUF5RA00@a-mtaout22.012.net.il>; Thu, 20 Mar 2014 05:45:06 +0200 (IST) In-reply-to: X-012-Sender: halo1@inter.net.il X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 140.186.70.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:87000 Archived-At: > Date: Wed, 19 Mar 2014 21:14:22 +0000 > From: Reuben Thomas > Cc: Stefan Monnier , Andreas Schwab , > 17036@debbugs.gnu.org > > > Don't believe the sales people. MS's execvp is buggy, and even if we > > forget about those bugs, it won't do what is expected here: it won't > > keep the file descriptors open in the original process still open in > > the overlaid process. That's because there's no 'exec' system call on > > Windows, so execvp is _emulated_: the original process simply invokes > > the new one as its child process, and then immediately exits. > > > > That's good enough for restart-emacs. Maybe so, it's hard to say, since you never described what that should do. > > So the answer to Stefan is: no, this cannot be done on Windows, not > > without some custom code to let the re-executed Emacs inherit all of > > the file descriptors which were open in the original Emacs process. > > > > It's fine for what i had in mind, namely Emacs simply launching another > command with arguments, much as a Lisp callcc. This could be documented as > a limitation on Windows. I very much doubt that this limitation would not render the whole issue moot on Windows. E.g., how will restart-emacs then be different from a simple call-process? But again, since you didn't say what the feature is supposed to do, ...